Comparing First Service Conception Rate Before and After Milking in Holstein Cows
نویسندگان
چکیده مقاله:
The objective of this study was to comparing first service conception rate before and after milking and changes in metabolite and hormones during four times realted to milking in lactating dairy cow. High producing Holstein cows (> 30 Kg/d and BCS) were randomlly selected and assigned into two groups: 1- insemination before morning milking (0700 a.m, n = 150) and 2- insemination after morning milking (0900 a.m, n=150). Milking performed at 0800 a.m. All cows synchronized with G7G-Ovsynch protocol started at d 30 postpartum. Blood samples collected from subsample of cows (n = 45 per group) and at four times (before milking, with milking, 1 h after milking and 2 h after milking) for measauring glucose, triglyceride, free fatty acids, albumin andcortisol concentrations. Results showed Glucose, trigyceride, free fatty acids, abumin and cortiso concentrastions affected by miking time (P<0.05) and significanty increased with milking compared to before milking (P<0.05) but significanty decreased 1 h after milking compared to milking and before milking. Conception rate at d 32 and 60 after AI were greater in cows inseminated after milking in comparsin with before milking. In conclusion results of present study showed insemination of cows after milking compared to before miking resulted in increase fertility.
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عنوان ژورنال
دوره 10 شماره پاییز
صفحات 79- 85
تاریخ انتشار 2019-11
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